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Negatory.......most bridge joints are not joined together anyway. They either have an expansion joint or a construction joint above nearly every column so they can move and flex a little with the weight of hundreds of cars and trucked crossing them.It didn't melt anything, it burned hot enough to weaken the joints where the sections are joined together. Then the weight made it collapse.
It wasn't PVC - it was HDPE which is highly flammable. And it was empty conduit, no FO, so the tubes did a great job of delivering air to the fire itself.
You are correct. Anybody can go on google earth and go to street level on the Buford connector and see how much roll pipe was under there. There was a lot.
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I could ex plane this to you, but it would be way over your heads so I am not going to waste my time.